/*
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is ST_EXT-S_UIMAST.
 *
 * The Initial Developer of the Original Code is
 * University of Rome, Tor Vergata
 * Portions created by the Initial Developer are Copyright (C) 2009
 * the Initial Developer. All Rights Reserved.
 */

package it.uniroma2.art.uimast.impl.types;

import it.uniroma2.art.ontapi.ARTResource;
import it.uniroma2.art.ontapi.vocabulary.XmlSchema;
import it.uniroma2.art.uimast.xpts.IVariantVisitor;
import it.uniroma2.art.uimast.xpts.Variant;

import javax.xml.bind.DatatypeConverter;

/**
 * A variant able to hold <code>byte</code> values.
 * 
 * @author <a href="mailto:manuel.fiorelli@gmail.com">Manuel Fiorelli</a>
 * 
 */
public class ByteVariant extends Variant
{

    public void applyVisitor(IVariantVisitor visitor)
    {
        visitor.visit(this);
    }

	@Override
    public boolean isCompatible(ARTResource cls)
    {
        return cls.getURI().equals(XmlSchema.BYTE);
    }

	@Override
    public boolean isLexicalRepresentation(String lexicalForm)
    {
        try
        {	// tries to parse the given string to decide if it is a valid lexical form.
            parse(lexicalForm);
        }
        catch(IllegalArgumentException e)
        {
            return false;
        }
        return true;
    }

	@Override
    public boolean setValue(String lexicalForm)
    {
        try
        {
            value = parse(lexicalForm);
        }
        catch(IllegalArgumentException e)
        {
            return false;
        }
        return true;
    }

	/**
	 * Parses a lexical representation of the underlying type.
	 * 
	 * @param lexicalForm
	 *            a lexical representation
	 * @return the corresponding value
	 * @throws IllegalArgumentException
	 */
    private byte parse(String lexicalForm)
        throws IllegalArgumentException
    {
        return DatatypeConverter.parseByte(lexicalForm);
    }

    @Override
    public String getLexicalRepresentation()
    {
        return ""+value;
    }

	/**
	 * Gets the underlying value.
	 * 
	 * @return the underlying value
	 */
    public byte getValue()
    {
        return value;
    }

    @Override
    public String getValueAsString()
    {
        return ""+value;
    }

    /** The underlying value. */
    private byte value;
}
